Steady And Dynamic Simulation And Structure Optimization Design Of A Synchronization Valve

Hydraulic synchronization control systems are applied widely because of its merits of the higher control precision, the more quick response speed, the bigger anti-load rigidity in aerospace, metallurgy, military, engineering mechanical such as a bulldozer and a road roller. There are many control plans for hydraulic synchronization. But the hydraulic system by using the synchronization valve has many merits: the simple structure, easy to manufacture, the low cost and the strong reliability. Therefore the development research of the synchronization valve has become a focus. However, in current domestic enterprise of producing hydraulic elements, the domestic capability of designing synchronization valve has very big disparity comparing with the overseas, some feasible plans are framed only by experiences of the most designers and it is difficult to achieve the goals of automatic decision-making and plan optimization. The development of materials science and manufacture technology caused the author to have an idea of optimizing the structure of synchronization valve under fulfilling work demand. Optimization designing provided an important science design method for mechanic design. Under the limited raw material condition, not only the weight can be reduced, but also reduce material spending and enhance the product's quality and performance, then promote the development of microminiaturization in hydraulic domain.In the paper, the synchronization valve was taken as the research project. Based on work principle and structure feature of the synchronization valve with reversing piston, the mathematical model was built for the static and dynamic emulation and analysis. According to theory analysis and simulation computation, it is found that the dynamic response speed of the synchronization valve is very quick, but the size of the overall structure looks so big. So the structure should be further optimized by reducing its volume and weight under the condition of keeping static-dynamic performance. This provides an academic basis for the structure optimization of the synchronization valve. On the base of emulation and analysis of static-dynamic performance, this paper put forward the method of structure optimization design of the synchronization valve based on Genetic Algorithm. Mathematical model and optimization model were built. The structure of the synchronization valve was optimized by Genetic Algorithm. The concrete scheme is as follows: when the synchronization valve works normally, try to compress volume and reduce the weight by changing the main body of synchronization valve to save the raw material and the processing cost keeping strength condition, rigidity condition and the size of design variables. Finally, analyses and contrasts of the optimization results prove the feasibility and efficiency of the optimization design method.This paper took the steady and dynamic quality analysis and structure optimization design of a synchronization valve as a master line, union the Genetic Algorithm optimization design. An expatiation was made from the aspects of the principle and simulation analysis. Every chapter was arranged as follows:The first chapter: Introduction. The basic knowledge of the synchronization valve was introduced. Based on documents from domestic and overseas, the research tendency of the synchronization valve was discussed from the aspects of new structure and new performance. The development tendency of the synchronization valve was generalized. Finally, the research goal, significance and content of this subject were summarized.The second chapter: The synchronization valve with reversing piston. The work principle of the synchronization with reversing piston valve was introduced when it was in flow divider and combiner working condition. And its structure and performance were made an expatiation in detail. The analysis of the speed synchronization error was emphasized. The relationship between the speed synchronization error and the flow was discussed. And the primary factors of influencing the precision of dividing flow were listed. Meanwhile, the relationship between pressure loss and the flow was researched. The reason of pressure loss was analyzed. This provided the theory guide for choosing design parameters reasonably.The third chapter: Steady and dynamic quality simulation and research. Firstly, the basic knowledge about system simulation technique was introduced. The simulation software AMEsim was summarized. Then, the mathematical model for steady and dynamic quality simulation was built. Finally, the simulation results were discussed thoroughly and draw a conclusion that the more quick response speed but the size was big. This provided a theory basis for the optimization design of the synchronization valve.The fourth chapter: Structure optimization design of the synchronization valve. Firstly, the mathematical model for optimization design of the synchronization valve was built. Then, the concrete method of the optimization design by Genetic Algorithm was discussed. Finally, the optimization results were analyzed and contrasted in detail. This confirmed the feasibility and efficiency of the optimization design method.The fifth chapter:Finite element analysis of the synchronization valve. Firstly, the geometric models of the valve core and the valve body were built by using the three-dimensional software CATIA. The suitable model was given. Then, the preload stress, deformation and strength were analyzed and calculated. Finally, it is concluded that the most probable damaged district can be intensified by choosing reasonable materials.The sixth chapter: Conclusions. All work was summarized and the advice was provided for the further research. This provided the reference for the next research about the subject.